Method of making spinning bobbins



March 8,- 1932 H. LAMPART METHOD 0 MAKING SPINNING BOBBINS Filed Aug. 7. 1950 Patented Mar. 8, 1932 UNITED STATES PATEN r OFFICE HUGO LAMPAB'I', OI KA BLSB'UHE, GERMANY, ASSIGNOR 'I'O BEBLIN-KABLSBUEEB INDUSTBIE-WEBKE.A.-G., F KARLSRUHE, GERMANY METHOD 0! MAKING SPINNING BOBBINS Application filed August 7, 1930, Serial R0. a t 8,704, and in Germany December 17, 1989.

My invention relates to spinning bobbins and more specifically to a method of producing lacquered bobbins and the like with per-- forations, for the textile industry and the artificial silk or rayon in particular. I

My improved method is distinguished from those already known in the art by the feature that when the material is displaced-by flat- (generally ustry in tened dies or plungers "for the purpose of the perforations, beads or projecproducing tions are ormed at both sides below the edges bevelled or chamfered under anacute'angle so that in the wall of the perforation a or set-back portion is located between these beads adapted for the reception of a coating or layer of lacquer of about double the normal thickness.

When lacquering or varnishing the bobbin the excess lacquer accumulates in the recess in the wall of the perforation and from these distributes itself by flowing towards the sides of the bobbin just before drying up. In order to prevent a displacement of the material towards the surface of the shell of the bobbin when embossing the bevelled face, the bevel or cha nfer forms according to'my invention an acute angle with the shell of the bobbin body, preferably one between 20 and 9 The advantage of my improved method.

is that a certain quantity of lacquer accumunal surface of the bobbin.

lates in the recess within the wall of the opening the excess of which is able to flow out siand formingpart thereof an embodiment of .by way of exmy invention is illustrated ample. In the drawings Fig. 1 is a side view of a bobbin with openings or perforations in the shell,-

F1 g. 2, an opening after the bevelling of the edges and formation of the beads, in cross- I I sectlon on an enlarged scale, and

multaneously towards both sidesshortly be:

prises in displa'cm the sharp ed es of the .provided with a plurality of circular perforations b. After the perforations or openings b which naturally might also be oval, po ygonal or oblong have been punched out, the sharp edges are subsequently flattened out and bevelled at bothsides and uniformly by ;pressing a tapering punch or die into the 1 openin or in any other suitable manner as shown 1n Fig. 2 of the drawings. By the dis placement of the substance of the bobbin towards the inside of the opening two am nular beads or semi-circular PIOJGQtiODS G are formed so that the wall of the opening re-- cei'ves a central a ular recess cavit or groove (1. To avoid a displacement o the material of the bobbin towards the outside, i. e. towards the surface of the shell, the bevel or chamfer e is provided under an angle'a of 20 to 35. degrees to the surface of the shell. When the thus prepared bobbin b is varnished about double the uantity of lacquer or varnish remains in t e cavity of the wall which would remain if the perforation were cylindrically straight, see Fig. 3 of the drawings. The lacquer is thus able to spread better just prior to drying up and to distribute itself over the heads towards the exter-- I claim as'niy invention 1. A method of shaping and finishing the perforations in spinning bobbins which comprises in displacin the sha edges of the perforation towar s the inslde thereof to form beads at both sides and a central cavity in the wall of the erforation between the beads, and coatin -t e perforation so that a double coating wi be formed in the annular cavity and on the beads.

perforations in spinning bobbins which comrforation' towar s the inside t ereof to orm beads at both sides and a central annular cavity in the wall of the perforation between the beads, and coatin' the perforation with lacquer so that a ouble coating 2.. A method of shaping and finishing the thereof will he formed in the annular cavity and on the heads.

3. A method of shaping and shing the perforations in spinning bobbins which com- 6 prises in displaclng the sharp edges 01% the perforation towards the inside to term heads at both sides under an angle of between 20 and 35 and a central annular cavity in the wall ofthe perforation between the beads,-

m and coating the perforation with lacquer whereby a double coating thereof will he formed in the annular cavity and distribute itself over the sides of the hohhin and on the heads. v

15 In testimony whereof, I a my signeture,

HUGO 

